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Why Cohen's new admission is 'incredibly significant'

Clip: 11/30/2018 | 9m 13s

Michael Cohen now admits he lied to Congress to obscure contacts with Russia during the presidential campaign. John Yang reports, and Judy Woodruff speaks with Garrett Graff, Wired magazine contributor and author of "The Threat Matrix: Inside Robert Mueller's FBI and the War on Global Terror," about what the new development could mean for the Mueller investigation.